Add g++-multilib build dependency when cross building for ARM.

build/install-build-deps.sh

 #!/bin/bash -e
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to install everything needed to build chromium (well, ideally, anyway)
 # See http://code.google.com/p/chromium/wiki/LinuxBuildInstructions
 # and http://code.google.com/p/chromium/wiki/LinuxBuild64Bit
 
@@ skipping 88 matching lines @@
           libxcb1-dbg libxcomposite1-dbg libxcursor1-dbg libxdamage1-dbg
           libxdmcp6-dbg libxext6-dbg libxfixes3-dbg libxi6-dbg libxinerama1-dbg
           libxrandr2-dbg libxrender1-dbg libxtst6-dbg zlib1g-dbg"
 
 # arm cross toolchain packages needed to build chrome on arm
 arm_list="libc6-armel-cross libc6-dev-armel-cross libgcc1-armel-cross
           libgomp1-armel-cross linux-libc-dev-armel-cross
           libgcc1-dbg-armel-cross libgomp1-dbg-armel-cross
           binutils-arm-linux-gnueabi cpp-arm-linux-gnueabi
           gcc-arm-linux-gnueabi g++-arm-linux-gnueabi
-          cpp-4.5-arm-linux-gnueabi gcc-4.5-arm-linux-gnueabi

[iannucci, 2012/12/17 19:52:23]

Are we sure these AREN'T used? Or are these implicit deps of g++-multilib?

-          g++-4.5-arm-linux-gnueabi libmudflap0-dbg-armel-cross"
+          libmudflap0-dbg-armel-cross"
 
 # Plugin lists needed for tests.
 plugin_list="flashplugin-installer"
 
 # Some package names have changed over time
 if apt-cache show ttf-mscorefonts-installer >/dev/null 2>&1; then
   dev_list="${dev_list} ttf-mscorefonts-installer"
 else
   dev_list="${dev_list} msttcorefonts"
 fi
@@ skipping 66 matching lines @@
     do_inst_syms=1
   fi
 fi
 if test "$do_inst_syms" = "1"; then
   echo "Installing debugging symbols."
 else
   echo "Skipping installation of debugging symbols."
   dbg_list=
 fi
 
+# When cross building for arm on 64-bit systems the host binaries
+# that are part of v8 need to be compiled with -m32 which means
+# that basic multilib support is needed.
+if [ "$(uname -m)" = "x86_64" ]; then
+  arm_list="$arm_list g++-multilib"
+fi
+
 if test "$do_inst_arm" = "1"; then
   . /etc/lsb-release
   if test "$DISTRIB_CODENAME" != "precise"; then
     echo "ERROR: Installing the ARM cross toolchain is only available on" \
          "Ubuntu precise." >&2
     exit 1
   fi
   echo "Installing ARM cross toolchain."
 else
   echo "Skipping installation of ARM cross toolchain."
@@ skipping 229 matching lines @@
              sed -e 's/[.]so[.][0-9].*/.so/' |
              sort -u); do
     [ "x${i##*/}" = "xld-linux.so" ] && continue
     [ -r "$i" ] && continue
     j="$(ls "$i."* | sed -e 's/.*[.]so[.]\([^.]*\)$/\1/;t;d' |
          sort -n | tail -n 1)"
     [ -r "$i.$j" ] || continue
     sudo ln -s "${i##*/}.$j" "$i"
   done
 fi